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<p class="MsoNormal"><span style="color:#1F497D">Hi everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Quick question regarding the usage of keep=1 while creating the tape. Would the following snippet create the memory leak:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">int keep = 1;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">while (1)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D"> trace_on(0,keep);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">// <<= operations<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">// …<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">// ==> operations<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">trace_off();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">jacobian(…);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New";color:#1F497D">}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I was assuming that since the tag number remains 0, then the Taylor stack would be overwritten. Is that correct?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I am currently observing a RAM increase with our code when using ADOL-C and trying to figure out its origin. We are using ADOL-C in a CFD adjoint design optimization process, in which the code constantly computes
jacobians for different geometries. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I launched valgrind on the side, but since the application uses MPI, valgrind outputs many “false positives”…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thank you for your time,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Antoine<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="FR" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De :</span></b><span lang="FR" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> adol-c-bounces@list.coin-or.org [mailto:adol-c-bounces@list.coin-or.org]
<b>De la part de</b> Ralf Juengling<br>
<b>Envoyé :</b> Tuesday, April 07, 2015 4:33 PM<br>
<b>À :</b> adol-c@list.coin-or.org<br>
<b>Objet :</b> [ADOL-C] Can ADOL-C handle FFTs?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to use ADOL-C for a problem Y = C(X) where the implementation of C uses FFT routines and I want ADOL-C to give me the gradient of C wrt X.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I did a quick trial using the pyadolc Python wrapper and that failed. Before I play around further, could someone tell me if ADOL-C can handle FFTs at all? If not, can any automatic differentiation tool do this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<br>
Ralf<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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